Consider how little is actually injected into the human body (sub milligram dose mixed with saline solution), even if it was toxic, I doubt it would have any ef

Consider how little is actually injected into the human body (sub milligram dose mixed with saline solution), even if it was toxic, I doubt it would have any effect at this scale. And btw, there is no difference between lipids we can make and lipids that our cells make. It's the same chemical composition.